Loop-taker mechanism for sewing-machines.



Patemuan. 7 I902.

No. 690,722. .w. GROTHE.

LOOP TAKEN MECHANISM FOR SEWING MACHINES.

' (Application filed. une 17, 1901. (III) Model.)

V I C, I k 4 I .2?- V e c I. "I 'I' 4 l) 6!; I I

THE "bums nrrzns co. mom-urns" WASHINGTON, 0.1:,

UNITED STATES PATENT." OFFICE.

WILLIAM GROTI-IE, OF CLEVELAND, OHIO, ASSIGNOR TO THE WHITE SEIVINGMACHINE COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

LOOP-TAKER MECHANISM FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent 110,690,722, dated January7, 1902.

Application filed June 17, 1901.

' To all whom it may concern:

Be it known that LVVILLIAM GROTHE,a citizen of the United States,residing at Cleveland, in the county of Ouyahoga and State of Ohio, haveinvented a certain new and useful Improvement in Loop-Taker Mechanismfor Sewing-Machines, of which the following'is a full, clear,and exactdescription, reference being had to the accompanying drawings.

The invention relates to the type of sewing-machines in which thestitchforming mechanism includes a loop-taker which carries the lowerthread and is moved about its axis through the loop of the upper threadby a driver which moves about an axis lying at an angle to the axis ofthe loop-taker.

The primary object of the invention is to prevent the upper thread frombecoming entangled with the loop-taker driver or its fingers.

The invention consists in the combination,

with the loop-taker and its driver having the characteristics referredto, of a guard-plate located between the driver and loop-taker andmounted to turn with the driver on an axis at an angle to the axis ofthe driver and having holes through which the driver-fin gers pass tothe loop-taker.

In the drawings, Figure l is aside elevation, partly in section, of theloop-taker housing and the parts which it supports. Fig. 2 is an endView of the same parts when the looptaker and the retaining-platetherefor have been removed.

Referring to the parts by letters, A represents the bed-plate of asewing-machine head,

and a anintegral bracket projecting from the under side thereof. Theloop-taker housing B has a cylindrical stem 1), which is clamped in saidbracket and has a bell-shaped front end b. Through the stem acylindrical hole is formed in which the shaft 0 of the looptaker driveris rotatably mounted. Secured to that end of this shaft which projectsinto the bell-shaped end of the housing is a crossarm 0, near theextremity of which are forwardly-projecting fingers c. The loop-taker Dis rotatably mounted in a cylindrical rabbet or groove 1) in the frontedge of this bellshaped portion of the housing, the axis of this groovebeing at an angle to the axis of the Serial No. 64,813. (No model.)

driver-shaft. The loop-taker is held in its guide grooveb by aretaining-plate F, secured to the front end of the housing, and saidloop-taker has two holes (1 01', into which the driving-fingers 0'project, whereby the loop -'taker is moved about its axis by the driver.Because the axes of rotation of the loop-taker and said driver,respectively, are at an angle to each other each finger c is entirelywithdrawn from its engagement with the loop-taker when said finger is atits highest point. At this time theloop-taker is bein g driven by theother finger. Because of this construction and operation the loop-takermay pass through the loop of the upper thread and one strand of saidloop may pass between the loop-taker and first one drivingfingerand thenthe other.

So much of the construction as is above described is old and itconstitutes one specific structure having certain defects which it isthe object of this presentinvention to cure. For example, if one shouldcarelessly start the machine after it is threaded and without any clothin position for the needle to pass through the loop from the upperthread frequently becomes entangled with one or both of said driving:fingers. When this happens, it is generally necessary to remove theloop-taker and then remove this tangled thread. To prevent thisoperation the guard-plate E is provided, which plate is rotatablymounted in a cylindrical groove b inside the bell-shaped end of thehousing and between the loop-taker and the driver, the axis of thisguide-groove being preferably coincident with the axis of theloop-taker, although some slight variation from-this position ispermissible. This plate has two holes 6 e, through which thedriverfingers passto the loop-taker, and therefore as the driver rotatesit rotates this guardplate, as well as the loop-taker. The driverfingersare, however, because of the angular relation between the axes of thedriver and the guard-plate, respectively, caused to move backward andforward through the holes in this guard-plate; Whena machine is prooffby this guard-plate during each rotation thereof.

In order to be able to cause the described engagement of thisguard-plate in this internal groove h, in which it ismounted, the plateis made in two or more sections 6 e", which are fastened together byscrews or other suitable means after the edges of the said sections havebeen inserted in said guide-groove 6 Having described my invention, Iclaim- 1. In a sewing-machine, the combination of a rotatable loop-takerhaving holes which are substantially parallel with its axis and areadapted to receive the driver-fingers, a guardplate lying behind andclose to the loop-taker and mounted to rotate upon the same axis, andhaving holes through which the driverfingers may pass, with a rotatabledriver-shaft having fingers rigidly secured thereto and projectingforward from its end through the holes in the guard-plate and into theholes in the loop-taker, whereby both the loop-taker and guard-plate aresimultaneously rotated by the driver-fingers, said driver-shaft beingmounted with its longitudinal axis at an angle to the loop-taker andguard-plate, whereby the driver-fingers are caused to engage and reccdefrom the holes in tho loop-taker, substantially as and for the purposespecified.

2. In a sewing-machine, the combination of a loop-taker housing, havinga bell-shaped end in which is an annular groove in which the 1ooptakeris rotatably mounted, and behind this another annular groove in a planeparallel to the plane of thefirst-named groove, with a loop-takerrotatably mounted in the groove provided therefor, and having holes toreceive the driver-fingers, a guard-plate located between the loop takerand driver and composed of two separable sections secured together, andhaving its edge rotatably mounted in the groove in the housing behindthe loop-taker, and having also two holes through which thedriver-fingers pass to said loop-taker, and a driver-shaft having,inside the bell-shaped end of the housing, forwardlyprojectingdriving-fingers which pass through the holes in the guard-plate andengage the holes in the loop-taker and operate to simultaneously rotateboth the looptaker and guard-plate, said driver-shaft being mounted withits longitudinal axis at an angle to the axis of the loop-taker andguard-plate whereby the driver-fingers are caused to engage and retreatfrom the holes in the loop-taker, substantiallyas and for the purposespecified.

In testimony whereof I hereunto aflix my signature in the presence oftwo witnesses.

WILLIAM GROTI-IE. \Vitnesses:

ALBERT II. BATES, H. M. WISE.

